MIL-STD-1798C
d. An act of restoration, ranging from cleaning or replacement to complete overhauls: Restoration is that work necessary to return the item to a specific standard. The scope of each assigned restoration task has to be specified since restoration may vary from cleaning or repairing, to complete overhauls.
e. A time change of the component if a specific life cycle can be determined. Time Change Items are replaced at specified intervals. The primary objective of a time change is to achieve maximum utilization of components consistent with the economic operation of the weapon system, support systems, and equipment without jeopardizing flight or operational safety. Time change item identifiers are only prescribed for those items that have a measured service life expectancy and display an age-related failure pattern.
f. Periodic Checks of Emergency Systems: The MECSIP team shall implement recurring checks, at appropriate intervals,to verify all emergency systems (e.g., Life Support, fuel dump, ram air turbine, emergency landing gear extention, fire extinguisher bottle squibs, etc.) are available if needed to address aircraft emergencies.
g. Combination: any combination of the actions listed above.
5.5.4.2 Develop a program for routine health assessment of EWIS.
A schedule for routine health assessment of the Electric Wire and Interconnect System shall be developed per the guidance contained in the EWIS Integrity Program MIL-HDBK-525.
5.5.5 Subtask 5 - Manage Service Life Extension and Final Five Years Prior to
Retirement.
5.5.5.1 MECSIP considerations during a Service Life Extention Program (SLEP).
During consideration of a Service Life Extention Program, it is important that all factors necessary to extend the life of the system be appropriately considered. Within MECSIP systems, some equipment is intended to remain on the aircraft over the life of the system. In addition, some equipment will cease to be sustainable due to DMS issues.
5.5.5.1.1 Service Life Assessment Program.
When 10 percent of the MDS fleet reach 50 percent of the aircraft service life based on flight hours or landings, whichever occurs first, the SM shall iniatiate a Service Life Assessment Program for MECSIP equipment. The SLAP will be the basis for aircraft program decisions concerning the future service life of the components/ systems at the same time as the airframe decisions are being made. The Service Life Assessment Plan is the document that guides the SLAP effort and includes aircraft to be examined, systems/components to be assessed, and outcome reporting requirements. The SLAP Report contains detailed results of the execution of the SLAP. The SLAP program shall examine all MECSIP equipment. NOTE: There is no requirement to perform a SLAP if there is no intention of executing a SLEP for the MDS.
5.5.5.1.2 Service Life Assessment of hydromechanical systems.
Many MECSIP components, particularly those with existing life limits, do not require assessment beyond investigation of continued availability of sources of repair. For MECSIP components which are overhauled, SLAP shall look at the overhaul procedures to see if any changes are warranted as the aircraft life is extended. Other MECSIP equipment (e.g., fuel/hydraulic/ECS tubes, brackets seals etc.) age and require a comprehensive look at the need to potentially replace the entire system or increase inspections before the fleet reaches the end of the life extention. By performing the SLAP in advance of the SLEP decision point, decisionmakers can understand all of the costs and risks associated with a SLEP program in
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